Defoe has scored four goals since his arrival, but is aiming for a total that could put him in the mix for the Golden Boot.
Defoe told the Sunderland Echo he is raring to get back to business and pre-season training before the new Premier League season starts on 8 August.
He said to the Sunderland Echo: “Hopefully we’ll have a good pre-season and we can start the season really strong.
“People say you should always aim for 20 goals in a season and if I’m scoring goals it’s only good for the club and the team.”
Defoe may not have got as many goals as he would've liked after he arrived at the Stadium of Light but crucial strikes against Newcastle United and Everton endeared him to the club's fans and earned the side essential wins in order to avoid the drop.
However, four goals from 17 Premier League games is a goalscoring rate which needs improvement in order for the 32-year-old to truly excel.
Before the arrival of Dick Advocaat last season, it seemed that Sunderland were fighting it out with the likes of Burnley and Aston Villa to be the lowest scorers in the division.
Their goalscoring record didn't radically improve after the Dutchman's arrival but they scored at crucial times - doing enough to keep themselves in the division.
If you look at his goal-scoring pedigree down the years, you can see that Defoe has shown he is capable of scoring a large proportion of the side's goals, and a solid showing of around 15 would be something that Sunderland fans may happily take if others can chip in as well.